Many conspiracy theories are based on the best, most laughable argument I think is in existence. The formula goes something like this:
*person points out logical alternative, based on what actually happened*
*conspiracy theorist points out "that is what they want you to think"*
Therefore any argument against any conspiracy is null and void because the opposing argument is instantly turned into a part of the theory. To me it's a bit like saying "Rocks have feelings, consciousness, and the capacity to be self-aware; however they can't tell us". Very tricky to prove that statement wrong (as a logical statement, not a scientific one).